AMD Ryzen 9 3900XT vs AMD Ryzen 9 8945HX

Compare AMD Ryzen 9 Desktop 12 core CPU vs AMD Ryzen 8000 Series 16 core processor, specs and benchmark score. Which is the better CPU for gaming?

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Benchmark Score

Overall Score

A combined score of all workloads

8378 points
8535 points
1% slightly better overall score

Gaming Score

The raw gaming performance with a fast GPU

8533 points
5% slightly better gaming score
8107 points

Multitasking Score

Performance in workloads using up to 8 cores

8330 points
8825 points
5% slightly better multitasking score

Heavy Workload Score

Performance in workloads using up to 16 cores

8329 points
9118 points
9% slightly better heavy workload score

Free CPU Benchmark

Want to compare your processor against the Ryzen 9 3900XT and the Ryzen 9 8945HX? Download our free and quick PC Performance Test.

Other Benchmarks

Blender score

Blender score

Cycles Render (Samples per minute)

275.17 points
468.88 points
70% significantly higher Blender score

Specifications

Cores

Number of physical processing units

12
16
33% slightly more cores

Threads

Number of logical processing units

24
32
33% slightly more threads

Clock Speed

Base frequency at which the chip operates

3.8 GHz
51% significantly higher clock speed
2.50 GHz

Turbo Speed

Higher frequency used for heavy workloads

4.7 GHz
5.4 GHz
14% slightly higher turbo speed

TDP

Thermal Design Power: Measure of heat generated by the CPU

105 W
55 W
90% significantly lower TDP

L1 Cache

Smallest embedded memory, but the fastest

768 KiB
1024 KiB
33% slightly more L1 cache

L2 Cache

Secondary embedded memory, slower than L1 cache

6 MiB
16 MiB
166% significantly more L2 cache

L3 Cache

General memory pool for all cores

64 MiB
Identical
64 MiB

Other details

Rank

Ranking in the hardwareDB database

131st of 1,089
124th of 1,089

Family

The product line

Ryzen 9 Desktop
Ryzen 8000 Series

Release date

The official date of release of this chip

2020 July
2025 April

Memory Type

The type of memory used by this chip

DDR4
DDR5

Is Unlocked

Can this CPU can be overclocked

Yes
Yes

Ryzen 9 3900XT vs Ryzen 9 8945HX comparison

Our benchmark analysis concludes that the Ryzen 9 8945HX performs better than the Ryzen 9 3900XT. Despite this, the Ryzen 9 3900XT has the advantage in our gaming benchmark.

When comparing core counts for these CPUs, we notice that the Ryzen 9 8945HX has slightly more cores with 16 cores compared to the Ryzen 9 3900XT that has 12 cores. It also has more threads than the Ryzen 9 3900XT. These CPUs have different clock speeds. Indeed, the Ryzen 9 3900XT has a significantly higher clock speed compared to the Ryzen 9 8945HX. Despite this, the Ryzen 9 8945HX has a slightly higher turbo speed. The Ryzen 9 8945HX outputs less heat than Ryzen 9 3900XT thanks to a significantly lower TDP. This measures the amount of heat they output and can be used to estimate power consumption. The cache sizes of these CPUs are different. Indeed, the Ryzen 9 8945HX has significantly more L2 cache than the Ryzen 9 3900XT. However, both these chips have the same amount of L3 cache.

The more cores a CPU has, the better the overall performance will be in parallel workloads such as multitasking. Many CPUs have more threads than cores, this means that each physical core is split into multiple logical cores, making them more efficient. Indeed, the Ryzen 9 3900XT has more threads than cores. Each physical core is split into multiple threads.

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